A US Airways plane flight from Ireland to Pittsburgh made an emergency landing Wednesday in Philadelphia after a phoned-in bomb threat that later proved to be a hoax.

All 171 passengers and eight crew members were safely evacuated from Boeing 757, which had been moved to an isolated part of Philadelphia International Airport.

There were no immediate details on who received the bomb threat but a U.S. government official told Fox News it was a hoax.

US Airways Flight 777 was enroute from Shannon, Ireland to Pittsburgh. It landed in Philadelphia shortly before 2 pm ET and passengers exited via staircases before being taken to waiting buses.

US Airways said in a statement that the aircraft was moved to an isolated part of the airport out of an abundance of caution.

FBI spokeswoman Carrie Adamowski said agents were assisting Transportation Security Administration officials in investigating the incident.

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The Associated Press contributed to this report.